Real-Time equalizingReal-Time equalizing has become possible
by this Windows app!! (Freeware)

System requirement is following. Sound card needs to be full-duplex type, which accepts recording and playing
concurrently. Microphone and speakers are connected to
the card. DirectX Runtime is installed. See following
site to download. Windows 98 Windows Me Windows 2000 : DirectX 9.0aWindows 95 : DirectX 8.0a
Windows XP already includes DirectX.
Windows NT is out of support.